Design Economics And Cost Planning Flashcards
What does TPI stand for
Tender price indices
What does CPI stand for
Construction price indicies
What’s the difference between value management and value engineering
Value management is usually done at RIBA stage 0 or 1 and manages the value at a high level of the key elements
Value Engineering is done when the design is more developed and specific aspects are decided to improve value
How many numbered points are there in a cost plan as per NRM1
15
When is CPI taken
At the mid point of the construction programme
When is TPI taken
At the point of tender
Who produces SPONS
AECOM
Why is it important to have regional prices
Because material prices vary across regions (and labour if self employed)
Who produces BCIS
RICS
Are balconies included in the GEA
No
Where would you check to find out what’s included and excluded from GIA GEA and NIA
NRM1
Pros and cons of steel compared to concrete frame
Pros
Fast erection on site
Comparatively Lightweight
Gain more net internal area due to columns and beams being smaller
Cons
Inflation/ market uncertainty
Fire proofing costs
Prone to corrosion
Pros and cons of concrete frame compared to steel
Pros
Naturally Fire and Water resistant
Easy to mould and shape
Energy efficient when producing
Higher compressive strength
CONS
Low tensile strength and so requires reinforcement
Long curing time/ slower installation
Requires form work on site
What are some typical exclusions in a cost plan/ order of cost estimate
VAT
S106/ CIL
Prof fees
Finance Costs
Acquisition Costs
Inflation
What cost of advise would you give to a client at RIBA stage 1-4
Stage 1 - design was restricted to schedule of annotation and high level design aspirations. Using internal and industry data and the GIFA I could provide a high level estimate.
Stage 2-4 - Can provide an elemental costs plan which is updated as design develops based on drawings and specifications
How did I decide on the contingency level in my order of cost estimate
With the input of the project design we would produce a risk register.
My duty would be to advise the team on the cost allocation if the risk item should be realised.
By pricing the register and assigning probability and impact profiles the contingency can be calculated.
Define an order of cost estimate
The determination of possible cost in the early design stage based on the employers fundamental requirements
How would you advise the client to proceed if the cost plan exceeds the budget
Analyse the costs to assess the source of the increase and whether any element is abnormally high.
Propose value engineering
What would you do if you don’t have the design information to populate an element of the cost plan
I would make an assumption and check with the design team to ensure it was correct
What items did you price/ measure when valuing the concrete frame
Columns
Beams
Slabs
Reinforcement/ Rebar
Delivery
Labour
Plant
Delivery
What items did you price/ measure when valuing the steel frame
Beams
Columns
Fire and Water protection
Fixings
Delivery
Labour
What types of efficiency calculations are there when it comes to design economics
Wall to floor ratio
Net to gross ratio
What does the net to gross ratio do
It outlines the area of usable space as a ration of the gross internal area.
It’s can identify how much wasted space there is
How do you calculate wall to floor areas
External wall area divided by the gross internal floor area
How do you calculate the net to gross ratio
Gross area divided by the net area
What items did you price/ measure when valuing the PV charger variation
PV Chargers
Ducting
Trenching
Power
Labour
Name the main sources of costs data
Internal data
Quotes
BCIS
SPONS
What’s a functional unit
A unit of measurement representing the prime use of a building
When is the GEA often used
Planning submissions
How do you decide on the value of prelims in a cost plan
On a % basis (12-15%)
Bench mark a cost per month and allocate to the programme duration
How would you calculate the BWIC costs
As a % of the M&E
What’s the rough rate for reinforced concrete in situ
Foundation
Slab
Beam
Column
Walls
Foundations (not piles) - £190/m3
Slab - £200/m3
Column and Beam - £250/ m3
Walls - £220m3
SPONS 2023
What’s the rough rate for steel frame columns and beams
£2500/ tonne
Price of a pile
£3000per pile 750mm thick
What units are the following measures in
Concrete in situ
Steel frame
Piles
Windows/ cladding
Floor finishes
In situ concrete - m3
Steel Frame - tonne
Piles - nr
Windows/ cladding- m2
Floor finish - m2
Price of a steel and concrete frame overall
Steel - £300/m2
Concrete - £280/m2
Green and blue roof price
£150m2 - green
£130m2 - blue
